104 lines
1.8 KiB
C
104 lines
1.8 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <regex.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "text.h"
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static void grep(FILE *, const char *, regex_t *);
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static bool vflag = false;
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static bool many;
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static bool match = false;
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static char mode = 0;
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int
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main(int argc, char *argv[])
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{
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char c;
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int flags = REG_NOSUB;
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regex_t preg;
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FILE *fp;
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while((c = getopt(argc, argv, "Ecilnqv")) != -1)
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switch(c) {
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case 'E':
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flags |= REG_EXTENDED;
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break;
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case 'c':
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case 'l':
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case 'n':
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case 'q':
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mode = c;
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break;
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case 'i':
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flags |= REG_ICASE;
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break;
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case 'v':
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vflag = true;
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break;
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default:
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exit(2);
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}
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if(optind == argc) {
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fprintf(stderr, "usage: %s [-Ecilnqv] pattern [files...]\n", argv[0]);
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exit(2);
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}
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regcomp(&preg, argv[optind++], flags);
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many = (argc > optind+1);
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if(optind == argc)
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grep(stdin, "<stdin>", &preg);
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else for(; optind < argc; optind++) {
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if(!(fp = fopen(argv[optind], "r"))) {
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fprintf(stderr, "fopen %s: ", argv[optind]);
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perror(NULL);
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exit(2);
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}
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grep(fp, argv[optind], &preg);
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fclose(fp);
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}
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return match ? 0 : 1;
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}
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void
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grep(FILE *fp, const char *str, regex_t *preg)
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{
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char *buf = NULL;
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long n, c = 0;
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size_t size = 0;
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for(n = 1; afgets(&buf, &size, fp); n++) {
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if(regexec(preg, buf, 0, NULL, 0) ^ vflag)
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continue;
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switch(mode) {
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case 'c':
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c++;
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break;
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case 'l':
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puts(str);
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goto end;
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case 'q':
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exit(0);
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default:
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if(many)
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printf("%s:", str);
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if(mode == 'n')
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printf("%ld:", n);
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fputs(buf, stdout);
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break;
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}
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match = true;
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}
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if(mode == 'c')
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printf("%ld\n", c);
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end:
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if(ferror(fp)) {
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fprintf(stderr, "%s: read error: ", str);
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perror(NULL);
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exit(2);
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}
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free(buf);
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}
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